...to add what Dan offered....either move the thermo sensor or the wind sensor closer together. I know Lacrosse advertises something like 150' range but from my experience with this series station, closer is better.
A couple of other suggestions...
The instructions used to say put the solar panel under a 60 watt(?) bulb before install...?
Batteries, batteries, batteries. If you call Lacrosse the first thing that will ask is "are the batteries in all sensors NEW"
If all else fails....give Lacrosse a call. Although their stations may not be of a 'higher grade', they do seem willing to help and or replace.